15715717212009 has 4 divisors (see below), whose sum is σ = 20954289616016. Its totient is φ = 10477144808004.

The previous prime is 15715717212007. The next prime is 15715717212011. The reversal of 15715717212009 is 90021271751751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (15715717212007) and next prime (15715717212011).

It is not a de Polignac number, because 15715717212009 - 2¹ = 15715717212007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15715717212007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2619286201999 + ... + 2619286202004.

It is an arithmetic number, because the mean of its divisors is an integer number (5238572404004).

Almost surely, 2^{15715717212009} is an apocalyptic number.

It is an amenable number.

15715717212009 is a deficient number, since it is larger than the sum of its proper divisors (5238572404007).

15715717212009 is an equidigital number, since it uses as much as digits as its factorization.

15715717212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238572404006.

The product of its (nonzero) digits is 308700, while the sum is 48.

The spelling of 15715717212009 in words is "fifteen trillion, seven hundred fifteen billion, seven hundred seventeen million, two hundred twelve thousand, nine".